The owners of Grand Prospect Hall in Park Slope are turning to their longtime slogan of making “dreams come true” in an attempt to garner community support for a plan to build a hotel next store.

Michael and Alice Halkias, owners of the venerable wedding mill along Prospect Avenue, are known for their over-the-top commercials promising to “make your dreams come true.” Now they have begun distributing flyers asking the community to “Make Our Dreams Come True… For a Change.”

They want to build a 150-room, 11-story hotel — to be called “Hotel Grand Prospect” — on its adjacent parking lot.

The project – to be introduced at a Community Board 7 meeting Jan. 13 — would also include a 400-space parking garage.

The flyer, however, does not mention the hotel but asks people to support their plans heading before the community board.

“Our dream is lots of happy, smiley neighbors! More parking. More shopping. More banking. An environmentally sustainable community,” it says.

“We, Michael and Alice, accustomed to making people’s ‘Dreams Come True,’ now want to share with you our labor of love for over 30 years in our community! Definitely, we were here a long time ago. Much before Park Slope attained its present ‘boom’ and social recognition. We are the ‘Originals in the Territory,’ and we to continue being of service to you all,” the flyer says.

The couple, who’ve been flooding the local airwaves with their commercials since buying the 118-year-old jewel three decades ago, also plan to pull the same stops pushing the hotel if it gets zoning approval.

Because of a 2005 area rezoning, the Halkaises can currently build no higher than six-stories high. They are seeking city approval to build higher.

Michael told the Post Tuesday that he “regrets not building the hotel before the” rezoning but believes he can garner enough community support.

He said the project would allow his business to better compete with its Manhattan counterparts by offering hotel space nearby for guests attending events.

He also said a parking garage would be a godsend for the neighborhood considering parking is already at a premium. The hall regularly hosts 2,000 or so guests on weekends at a time and can hold up to 8,000 in its various rooms.

Built in 1892, the legendary hall has attracted the likes of Ginger Rogers and Fred Astaire and mobster Al Capone used to frequent the hall’s former speakeasy and received his facial wound there that earned his “Scarface” nickname.